V belt



Sept. 16, 1941. T. L. HEDGPETH 2,255,884

V BELT Filed June 28, 1940 Patented Sept. 16,1941

V BELT TheronI L. Hedgpeth, Oak Park, lll., assigner to Duro Metal Products Company, Chicago, lli., a corporation of Illinois Application June 28, 1940, Serial No. 342,871

4 Claims.

The present invention relates to V-belts and is particularly concerned with V-belts adapted to be manufactured of rubber with suitable means for reenforcing the belt against tension l and reenforcing its working faces against wear.

When a V-belt is passed about small pulley,

yas is often the case, the belt tends to expand at its inner face, and, due to the tension in its. outer face, it tends to contract. The expansion of the inner face is caused by the compression at that face due to the shortening of that face and contraction which takes place in the section of the belt as any given part of the belt passes around a small pulley and a large pulley alternately.V

Another object of the invention is the provision of an improved rubber V-belt of the class described, which has its tension reenforcing'best located vto give the belt a substantially constant length and to permit alternate expansion and contraction of the section of the belt.

Another object of the invention is the provision of an improved V-belt structure by means oi which the working faces are suitably reenforced against wear and the wearing material is suitably sealed in the structure of the belt so that its edges can never become exposed and so that there is no possibility of oil or other deteriorating influences penetrating the interior ci' the belt and damaging the tension reenforcing.

Another object of the invention is the provision of a rubber yV-belt which is adapted to be usedV for a longer period of time before it is .necessary to replace the belt and which is adapt- I `the devices of the prior art.

Other objects and advantages of the invention I will be apparent from the following description and the accompanying drawing, in which similar characters of reference indicate similar parts throughout the several views.

Referring to the single sheet ofldrawings ac- Y companying this specification,

Figure 1 is an elevational view of the endless 'which does not produce any distortion in the section of the belt. Some deviations from this circular shape may be made without producing noticeable distortion of the cross-sectional shape, but such belts are usually employed for engage-` ment with driving and driven pulleys of widely different size and this involves the belt curving sharply abolita relatively small pulley;

Figure 2 is an enlarged cross-sectional view taken at right angles to the length of the belt showing the details of its structure;

' Figure 3 is an enlarged sectional view of the same belt as it appears when it ls distorted in being drawn tightly about a small pulley; and

\ Figure 4 lis an elevational view of the belt as it might appear when passing about a very small and a relatively large pulley, with notations indicating where the sections are taken on the planes of the lines 2-2 and 3-3 for Figures 2 and 3. s

The present V-belt is preferably endless and has its body I 0 of live resilient rubber, the entire belt being molded in one integral piece. The shape of the body I0 is trapezoidal, having the inner and outer fiat parallel sides I'I and I2 respectively and the oppositely sloping working sides I3 and I4.

The slope 0f these Working sides of the body corresponds substantially to the slope of. the groove in the V-pulleys with which the belt is to be used. The body I0 of the V-belt preferably has a multiplicity of strong cords I5-20 embedded in the body and equally spaced from each other and located inwardly o f, but close to, the outer side I2 of the body.

These cords may be strong cotton Acords which are impregnated withand embedded in the rubber stock and they are separated from each other and have no connection with each other so that the rubber stock is adapted to expand and contractvbetween the cords.

The inner face II and the sides I3 and I4 of the body I0 are preferably covered with a layer of fabric indicated at 2| which extends from the corner 22 at the outer side I2 down across the side I3, the inner side II, and the other side I4 of the belt to the corner 23.

Another layer indicated at 24 preferably ex` tends fully around all sides of the body I 0 embracing also the inner layer of fabric 2| and having its edges abutting at 25 midway between the borders of the outer side of the body I0.

In other embodiments of the invention the abutting joints of the edges indicated at 25 may V-belt showing the normal shape of the belt be made at other points on the side I2 which Since this layer is continuous and extends layer 2| may still hold the worhng faces of the belt intact sufficiently to give additional service.

The back side of the belt vis preferably provided with. an additional layer of resilient live rubberindicated at 29 which is also vulcanized to the fabric'layer 24 over the abutting edges of the fabric at 25. The resilient live rubber layer 29 vextends to the edges of the belt and may have itse edges vbeveled or cut of! at right angles to the planes of its body surfaces.

This layer 28 of rubber' on the baci; surface of When such a belt passes around a relatively small pulley, as shown .at the right in Figure 4, l the cross-section may approximate that shown in Figure 3 involving a contraction of the outersurl face and a slight curvature and an expansion of i the inner face. Whensuch a beltpasses around a large pulley, as` shown in Figure 4, it involves an expansion of the outer surface and a 'con-1 traction `of the inner face.

The present v-be1t is adapted to permit this i contracting and expanding action without proi ducing undue strain upon its reenforcing elements and therefore the belt is adapted to serve 1 for a longer period of time before it is necessary that the belt be replaced.

While I have illustrated a preferred embodiment of my invention, many modications may be made without departing from'the spirit of the 1 invention, and I do not wish to be limited tothe 1 precise details of construction set forth, but de f sire to avail myself of all changes within the scope of the appended claims.

AHaving thus described my invention, what I i' claim as new and desire to secure-by Letters Patent ofthe United States, is:

l. A rubber V-belt comprising a substantially trapezoidal rubber body characterized by the absence of reenforcing elements except aplurality 1 of separate cords'located adjacent the outer ,sur-

i lface of the belt and separated from each other by parts`of the rubber body, said belt being provided with a fabric wearing surface extending over its inner face and both of the working sides l are. not located midway. between the edges of ipvtnebeit. .o g

f j These layersof fabric are impregnated with the rubber stock and secured to the body by vulcanizing and cohesion and they may consist of layers of tightly woven cotton fabric which provide the working faces 2s and 2 of the belt 'and the inner face 2,8 with a reenforced wearing surface that is adapted to withstand the ywear to l which the working nfaces are subjected;

i about all of the corners, there is no possibility of the fabric being loosened except after it is worn t through completely, and even then the inner outerv face of the belt, and the edges of said fabric being sealedby the application of an additional strip of live resilient rubber vulcanized over the fabric at the outer face thereof, said belt having an additional layer of fabric located under the first-mentioned t layer and extending over the working sides and inner face of said belt.

o 2. A rubber V-belt adapted to expand and contract in cross-sectional shape as it passes about pulleys of 'dlerent size, comprising a rubber body having a plurality of separate tension reenforcing members located near the outer face but imbedded in said body, said tension members being spaced from each other, and a layer of wearfresisting fabric vulcanized to said rubber body and impregnated with the rubber of said body extending over the working faces of the V-belt and the inner face thereof, land a second layer of wear-resisting fabric extending over the same.

working faces and inner face and having its edgesbroughtinto abutting relation on the cute face o f said belt, 3. A rubber V-belt adapted to expand and contract in cross-sectional shape as it passes .about pulleys of diierent size, comprising a rubber body having a plurality of separate tension reenforcing members located near the outer face .but imbedded in said body, said tension members being spaced from each other, and a layer of wear-resisting fabric vulcanized to said rubber body and impregnated with the rubber of said body extending over the working faces of the V-belt and the inner face thereof, and a second layer of wearresisting fabric extending over the same Working faces and inner face and having its edges brought into abutting relation-ony the outer facev of said belt, and a sealing layer of live resilient rubber vulcanized to said latter layer at the outer face of said belt for` the purpose of securing its edges against wear and sealing the reenforcing elements of said belt againstingress of oil or other deteriorating elements.

4. An endless resilient belt of. Wedge shape adapted to expand and contract in cross-sectional shape as it passes around pulleys of different size,v

.comprising a resilient gum lbody of trapezoidal outer face of said belt for the purpose of securing its edges against wear and sealing the reenforcing elements of said belt against ingress of oil or other deteriorating elements, said belt yalso having a second layer of wear-resisting fabric located inside the mst-mentioned layer and extending over the `working faces and inside of said belt.

' THERON L. HEDGPETH.

of said belt andA about the outer corners to: the l 

